Abstract
0.8[ xB 2O 3–(1 − x)P 2O 5]–0.2Na 2O (with 0 ≤ x ≤ 1) glasses have been characterized by solution calorimetry at 298 K in acid solvent. The experimental data showed a strong negative departure of the enthalpy of mixing from the ideality described by the equation (in kJ/mol): Δ H = x(1 − x)(−660.2 + 570 x). The results were interpreted on the basis of the structural data. Enthalpies of mixing were consistent with sub-regular solution behaviour.
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